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Quantum Dynamics (QD)

18.12.2018

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The research interests of the QD group are quantum coherent dynamics and quantum many-body phenomena in designed nanosystems. We are active in the fields of ultracold quantum gases and nanoplasmonics, and we combine theory and experiment.

Research

The goal of the Quantum Dynamics group is to find novel quantum phenomena that may occur in future designed nanosystems. We target generic concepts, but two areas where the possibilities of designing and tailoring the systems are particularly fascinating are our focus: ultracold quantum gases and plasmonic lattice systems. In the latter we combine experiment and theory, while in the former our research is theoretical. The phenomena we have been interested in include superfluidity, superconductivity, topological phases of matter, Bose-Einstein condensation, lasing, and strong coupling between light and matter in the nanoscale.

We have found that exotic forms of superfluidity, such as the co-existence of superconductivity and magnetization, are especially stable in lattice geometries. Also, we have discovered that superfluidity in a flat energy band is connected to the quantum metric and has a lower bound given by a topological invariant, the Chern number.

The Quantum Dynamics group has experimentally observed strong coupling between dye molecules and plasmonic light modes. Arrays of metal nanoparticles offer us great opportunities for designing the band structure and the modes of light. We have observed lasing in a dark mode of such plasmonic lattices.

We fabricate plasmonic lattices using nanolithography and measure their optical properties in our lab, which includes a femtosecond laser setup for studies of quantum dynamics.

In the theory work, we use both analytical approaches and advanced numerical methods, such as dynamical mean field theory.

You can find below our Latest Publications (for more publications, from present to 2008, click "Research database" below the publication list and then "Research Outputs"), Media coverage which includes public-accessible descriptions of our work, and Alumni showing where people from our group have proceeded.

Latest publications

Department of Applied Physics, Quantum Dynamics

Lasing at K Points of a Honeycomb Plasmonic Lattice

Publishing year: 2019
Physical Review Letters

Department of Applied Physics, Quantum Dynamics

Quantum metric and effective mass of a two-body bound state in a flat band

Publishing year: 2018
Physical Review B

Quantum Dynamics, Department of Applied Physics

Induced p -Wave Pairing in Bose-Fermi Mixtures

Publishing year: 2018
Physical Review Letters

Department of Applied Physics, Quantum Dynamics

Spin-imbalanced Fermi superfluidity in a Hubbard model on a Lieb lattice